ive did the search and iam just confuseing my self. heres what i got iam running dana 44 ihave 16.1 x 13.5 ag tires there about 40 in tall. i put them on a 16 in wheel just to try them out,the wheels that i tried out were 7 in wide but i dont know what the back spaceing was , they were a friend of mine and he has since sold them. i have the original wheels that the tires were on and they are 12 in. wide.ihave about 5 inches of lift and trimed fenders. what do you gus think i shoud have for the backspaceing?